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Choice-predictive activity in parietal cortex during source memory decisions.

Roberto Guidotti1, Annalisa Tosoni1, Mauro Gianni Perrucci1

  • 1ITAB Institute for Advanced Biomedical Technologies, Department of Neuroscience, Imaging and Clinical Sciences, G. d'Annunzio University of Chieti-Pescara, 66100, Chieti, Italy.

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Summary
This summary is machine-generated.

Neuroimaging reveals the lateral parietal cortex plays a key role in memory-based decisions. This brain region tracks decision evidence, aiding recall from long-term memory.

Keywords:
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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Classical neurobiological research often emphasizes perceptual decision-making.
  • Real-world decisions frequently rely on long-term memory rather than immediate sensory input.
  • The lateral parietal cortex is implicated in encoding decision signals for memory tasks.

Purpose of the Study:

  • To investigate memory decision signals within the parietal cortex using functional magnetic resonance imaging (fMRI).
  • To test hypotheses regarding the role of parietal regions in memory-based judgments.
  • To explore the relationship between parietal activity and evidence levels in source memory tasks.

Main Methods:

  • fMRI study with parametric manipulation of evidence in source memory judgments.
  • Analysis of BOLD (blood-oxygen-level-dependent) signal modulation by decision evidence.
  • Decoding analysis of locally distributed activity patterns to identify choice-predictive signals.
  • Leave-one-subject-out cross-validation to assess cross-subject consistency.

Main Results:

  • Parietal regions showed BOLD signal modulation correlated with decision evidence.
  • A specific parietal cluster exhibited choice-predictive activity, even with minimal evidence.
  • Decoding accuracy increased with higher decision evidence, demonstrating a graded signal.
  • Parietal choice-predictive activity temporally correlated with medial temporal lobe activity.
  • Decoding patterns were consistent across participants.

Conclusions:

  • The lateral parietal cortex, particularly regions near the intraparietal sulcus, is crucial for memory-based decision-making.
  • These parietal regions represent a decision variable that integrates memory information.
  • Findings support a broader role for the parietal lobe in integrating memory and decision processes.